As you can see, my data is quite complex. What would be the best approach to work with this xml data.
I have tried everything from defining models with associations to converting the xml into JSON... I have really no clue, how I could get this data into a xmlTreeStore.

This code is mostly generated by Sencha Architect.
I am able to get the first layer (section) from the XML... but not the items. Another problem is, that the tree does not understand the nesting of sections... The rules for this XML are: